Force-driven transport through periodic entropy barriers

N. Laachi, M. Kenward, E. Yariv, K. D. Dorfman

Research output: Contribution to journalArticle

76 Scopus citations

Abstract

We analyze the transport of a point-size Brownian particle under the influence of a constant and uniform force field through a slowly varying periodic channel whose cross-sectional area variations represent effective "entropy barriers." Using generalized Taylor-Aris dispersion (macrotransport) theory for spatially periodic media, we compute the mean velocity and effective diffusion coefficient (dispersivity) describing the long-time global transport of the particle. Systematic asymptotic perturbation analysis illuminates the transport process occurring in the strong-field limit, notably the role of the mean-squared channel roughness. The results thus obtained compare favorably with Brownian dynamics simulations over the full range of driving forces.

Original languageEnglish (US)
Article number50009
JournalEPL
Volume80
Issue number5
DOIs
StatePublished - Dec 1 2007

Fingerprint Dive into the research topics of 'Force-driven transport through periodic entropy barriers'. Together they form a unique fingerprint.

Cite this